SEER Inquiry System - Report
Produced: 10/15/2025 11:54 PM
Question 20100052
Inquiry Details
References:
#1: ICD-O-3
#2: 2010 SEER Manual, 58. Rule 2, example 5
Question:
Discussion:
Answer:
A papillary carcinoma of thyroid tissue in benign struma ovarii (mature cystic teratoma) is reportable.
These ovarian tumors contain a diversity of tissues including hair, teeth, bone, thyroid, etc. This reportable malignancy arose in thyroid tissue within the ovarian tumor. Code the primary site to ovary. Code to the actual organ in which the cancer arose. This will keep the case in the appropriate category for surgery coding, regional nodes, staging, etc.